CinnaEntry Start free
TEAS MathematicsTypes and the Pythagorean theorem

TrianglesATI TEAS 7 cheat sheet

Types and the Pythagorean theorem

10 key facts Reviewed Oct 2026
Practice questions Save in app
The 1-minute sheetCinnaEntry

By Sides

  • Equilateral — three equal sides, all 60°
  • Isosceles — two equal sides and two equal angles
  • Scalene — no equal sides

By Angles

  • Right — one 90° angle
  • Acute — all under 90°
  • Obtuse — one over 90°

Pythagorean Theorem

  • a² + b² = c² — right triangles only
  • c is the hypotenuse, opposite the right angle
  • Common triples: 3-4-5 and 5-12-13

Area

  • A = ½ × base × height, height perpendicular to the base
Key takeaway

Types and the Pythagorean theorem

CinnaEntry website
CinnaEntry app: the study feed with a practice question
Study Triangles in the appTEAS 7 and HESI A2 question banks with a rationale on every answer and timed practice tests.See how CinnaEntry works
Start free
Want more TEAS Mathematics questions?We'll email you a free set on Triangles. No account needed.

Was this helpful?

Free to start

Know triangles cold

TEAS 7 and HESI A2 question banks with a rationale on every answer and timed practice tests.

  • TEAS 7 & HESI A2 question banks
  • Rationale on every answer
  • Timed full-length practice tests
  • 300+ cheat sheets
Start free on the web Download on theApp Store Get it onGoogle Play
See how CinnaEntry works
CinnaEntry website
CinnaEntry app: the study feed with a practice question